1890.] ON SOME UPPER CRETACEOUS FISHES. 629 



EXPLANATION OF PLATE LIII. 



Fig. 1. Diplothele walski, p. 622. 



1 a, Spicier in profile, without legs ; 1 b, sternum and labium ; 1 c, 

 eyes from above and behind ; 1 d, extremity of falx ; 1 e, tarsus of leg 

 of 1st pair ; 1 /, hinder part of abdomen, and spinners in profile ; 1 ff, 

 ditto from below ; 1 h, one of the maxillje. 



2. Dendricon rastratum, p. 623. 



2 a, cephalothorax in profile, without legs ; 2 b, eyes from above and 

 behind; 2 c, spinners from below. 



3. Migas paradoxus, p. 624. Nest. 



4. Platyoides abrahanii, p. 025. 



4 «, underside, showing maxillw, labium, and sternum; 46, eyes 

 from above and behind ; 4 c, Spider in profile, without legs ; 4 d, 

 extremity of tarsus of 3rd pair of legs ; 4 e, spimiers from below ; 4/, 

 genital aperture; 4y, lengths of the four legs. 



5. Bobsonia formidabiUs, p. 625. 



5 a, eyes from above and behind ; 5 h. Spider in profile, without legs ; 

 5 c, right palpus from outer side ; 5 d, lengths of two examples. 



6. Argyroepcira b/anda, p. 627. Abdomen, upperside. 



6 a, ditto in profile. 



7. Ictragnatha taylori, p. 627. One of the falces. 



8. Coergstris albkeps, p. 628. 



3. On some Upper Cretaceous Fishes of the Family o£ 

 AspidorhynchidcB. By A. Smith Woodward, F.Z.S. 

 of the British Museum (Natural History). 

 [Eeceived November 4, 1890.] 

 (Plates LIV. & LV.) 



xlmong the fishes met with in Upper Cretaceous rocks, there are 

 very few representatives of the " ganoid " types so characteristic of 

 earlier Mesozoic formations. Solitary survivors, however, do occur 

 in almost every fish-fauna of late Cretaceous date hitherto discovered ; 

 and conspicuous among these are members of the remarkably speci- 

 alized family of Aspidorhynchidse. It is of much interest to com- 

 pare the latest species of such a family with those by which it, was 

 represented at earlier periods ; and a large series of specimens in the 

 British Museum now enables this comparison to be made in a more 

 satisfactory manner than has hitherto been possible. A number of 

 undescribed fossils from the Upper Cretaceous of Brazil are referable 

 to the genus Belonostomus, and reveal most of the principal external 

 characters of the species they represent; while some fine examples 

 of another genus, as yet imperfectly described and inaccurately de- 

 termined, prove the occurrence of an allied, though more specialized, 

 fish in the corresponding formation of Mount Lebanon, Syria, 



Genus Belonostomus. 



[L. Agassiz, Poiss. Foss. vol. ii. pt. ii. 1844, p. 140.] 



Belonostomus comptoni. (Plate LIV., Plate LV. figs. 1-10.) 



1841. Aspidorhynchus comptoni, L. Agassiz, Edinb. New Phil. 

 Journ. vol. xxx. p. 83. 



